CPA Calculator
Calculate Cost Per Acquisition from ad spend and conversions, and check profit against your revenue per sale.
Campaign Parameters
Profit & Margin Bridge
Industry CPA Benchmarks
Benchmarks are illustrative industry averages for paid search/social acquisition costs — actual CPA varies widely by niche, region, and funnel. Click a value to apply it as your CPA input.
How CPA (Cost Per Acquisition) works
CPA (Cost Per Acquisition, sometimes called Cost Per Action) measures how much you spend, on average, to earn one conversion — a sale, signup, lead, or install. The core formula is: CPA = Total Ad Spend ÷ Number of Conversions. Rearranging that same relationship lets you solve for spend (Spend = CPA × Conversions) or for the number of conversions you can expect from a budget (Conversions = Spend ÷ CPA).
CPA alone doesn't tell you whether a campaign is profitable — that depends on how much each conversion is worth. This calculator compares your CPA against the revenue you earn per conversion to show profit per acquisition, overall margin, total net profit, and ROAS (return on ad spend, i.e. revenue ÷ spend). A campaign with a "low" CPA can still lose money if revenue per conversion is lower still, and a "high" CPA can be perfectly healthy if the resulting sale is valuable enough. All calculations run locally in your browser — nothing is sent anywhere, and the current inputs are encoded into the page URL so you can copy the link to share an exact scenario.
Private & free — this tool runs entirely in your browser.